Same here Dan, I used to build a few pc's 10 years ago and I've fixed some laptops for friends ie change a fan or screen that's it, I'm more software than hardware, I used to do it support again 10 years ago, I'm now an analyst so produce figures/reports and this is just a hobby I've wanted to do for a while as I love these old macs they had then at art college, you're not near the Midlands are you?
I mentioned I'm sending mine to be recapped and checked by Charles at macaps, recap and postage to the states and back is about £70, admittedly yours may set you back £120 but you only paid £90 so I think it's worth it